Formation grouting method and composition useful therefor
AssigneeGeochemical Corporation
InventorWilliam J. Clarke
Life of this patent
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Abstract
A method of grouting porous gas--and petroleum--bearing formations with a cementitious material comprising ultrafine ground slag is useful for primary and remedial cementing of a wellbore. A composition is provided which comprises water, a dispersant, slag and an accelerator to activate the slag.
Claims27
A method of grouting porous gas--and petroleum--bearing formations, which comprises injecting into said formation a composition comprising:
- (a) water
- (b) particulate slag, having a specific surface area greater than about 9,500 cm.sup.2 /g, with less than 3 wt. percent of the particles of said slag being larger than 7.8 micrometers in diameter;
- the proportions of water and slag being within a water to slag weight ratio range of between 0.5:1 and 10:1;
- (c) at least one dispersant in an amount effective to disperse the particles of said particulate slag;
- and
- (d) an accelerator in an amount effective to provide hydraulic reactivity to said slag.
A grouting composition comprising:
- (a) water;
- (b) a particulate slag comprising a microfine slag having a specific surface area greater than about 9,500 cm.sup.2 /g, with less than 3wt. percent of the particles of said slag being larger than 7.8 micrometers in diameter;
- the proportions of water and slag being within a water to slag weight ratio of between 0.5:1 and 1:1;
- (c) at least one dispersant in an amount effective to disperse the particles of said particulate slag;
- and
- (d) an accelerator in an amount to provide hydraulic reactivity to the slag.
A grouting composition comprising:
- (a) water;
- (b) a particulate slag comprising a microfine slag having a specific surface area greater than about 9,500 cm.sub.2 /g, with less than 3 wt. percent of the particles of said slag being larger than 7.8 micrometers in diameter;
- the proportions of water and slag being within a water to slag weight ratio of between 0.5:1 and 10:1;
- (c) at least one dispersant in an amount effective to disperse the particles of said particulate slag;
- and
- (d) an accelerator in an amount effective to provide hydraulic reactivity to said slag;
- said composition having been prepared by mixing in sequence (a) with (c) to form a first mixture, then adding (b) to form a second mixture, then adding (d) to said second mixture, and subjecting the resulting composition to strong agitation.
A method of grouting porous gas--and petroleum--bearing formations, which comprises injecting into said formation a composition comprising:
- (a) water
- (b) particulate slag, having a specific surface area greater than about 9,500 cm.sup.2 /g, with less than 3 wt. percent of the particles of said slag being larger than 7.8 micrometers in diameter;
- the proportions of water and slag being within a water to slag weight ratio range of between 0.3:1 and 10:1;
- (c) at least one dispersant in an amount effective to disperse the particles of said particulate slag;
- and
- (d) an accelerator in an amount effective to provide hydraulic reactivity to said slag.
Dependencies are inferred from the claim text.